Stringer for staircases.



No.8 53,134. PATBNTED-MAY 7,1907.

- (LP. STEIBER.

- STRINGBR FOR STAIRGASES.

APPLICATION FILED FEB. 8, 1907- N, N N

WITNESSES A TTOHNE rs THE Nonms pzrzns ca, wnsnmcram n. c.

CHARLES FRIEDRICH sTEIBER, OF NEW YORK, N. Y.

STRINGER FOR STAIRCASES.

Specification of Letters Patent.

Patented. May 7, 1907.

Application filed February 6,1907. Serial No. 356,085.

To (all whom it Wuty concern.

Be it known that I, CHARLES FRIEDRICH STEIBER, a citizen of the UnitedStates, and

' a resident of the city of New York, borough of the Bronx, in thecounty and State of New York, have invented a new and Improved Stringerfor Staircases, of which the following is a full, clear, and exactdescription.

This invention relates to stringers for staircases and the like, and theobject of the in vention is to produce a stringer having joints ofimproved form, giving the stringer great durability and strength.

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth in theclaims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference,

indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the innerside of a stringer constructedaccording to my invention; a portion of the stringer being representedas broken away; Fig. 2 is a cross section on the line 22 of Fig. 1 Fig.3 is a. side elevation showing a facing stringer used with the stringershown in Fig. 1; and Fig. 4 is a cross section of the stringer shown inFig. 3.

Referring more particularly to the parts, 1 represents the body of thestringer; this body presents a deep vertical web 2, which is formed atits upper and lower edges with horizontal flanges 3, sothat in crosssection, the stringer presents substantially the appearance of a deepchannel beam. In giving the strin er the form such as that shown in Fig.1, where the stringer is to be used in a staircase having a landing, thelower edge of the stringer is cut as indicated at the point 4. The cutextends through the lower flange and through the web 1 to the under sideof the upper flan e 3, but'the cut does not eX- tend through the upperflange. The part of the stringer which is to' form the landing is thenbent into an inclined position with respect to the lower portion 6 ofthe stringer, so that the web of the portion 5 projects across the webof the portion 6. The over.- lapping webs are then secured together byrivets 7 as shown. In this way the efiect is produced at the jointsimilar to that produced by the use of gusset plates. The .cut which isformed in the stringer before bending in the manner suggested, islocated so that after the stringer is bent, the position of the cutsubstantially bisects the angle formed at the knee 8 of the stringer.When this arrangement is adopted, it is found that the lower edge of thelanding portion 5 of the stringer will be supported upon the upper endof the lower flange of the lower portion 6;

in this way additional strength is given to the stringer.

At. the upper side of the landing a joint 9 is formed in a mannersimilar to that just described, the cut being formed, however, from theupper edge of the stringer to the upper side of the lower flange. Theoverlapping webs of the landing portion 5 and the upper portion 10 areconnected by rivets 11 as be fore. In this way, at the under knee 12formed at the joint 9, the lower flange is left intact as it is at thepoint 8. In this way the strength of the joints is materially increased.At the foot of the stringer a similar arrangement is adopted so as tofinish off the stairs with a vertical edge 13. At this point thematerial of the stringer is cut away in the form of a notch 14 includedbetween the dotted lines 15 and 16, and the cut on the line 16 isconveyed up to a point 17 lying just below the upper flange. This leavesa projecting tongue 18 having substantially theform of an angle iron,and this tongue is bent downwardly from the point 17 so that the flangeof the tongue lies along the line 13. As this part is not subjected toany strain, it is unnecessary to rivet the web 19 of the tongue to theweb of the stringer.

On the inner face of the web of the stringer I attach gains 20 andcleats 21 of angle iron, arranged as shown. At the landing portion 5 ofthe stringer, the gain is formed into a continuous strap 22 which runsalong the stringer, and this strap, if the landing is a wide one, isformed near its middle point with a pocket 23 for the attachment of across bar to support the middle portion of the landing. In order tofinish off the outside of the stringer, I provide a facing stringer 24,the construction of which is shown in Fig. 3. This facing stringerpresents a flange 25 at the upper edge thereof, the lower edge of thestringer being bent upon itself so as to form a half round roll'26, orbead. W'ithin tnis bead a half round truss rod 27 extends, which acts asa stiffener for the stringer. In the angle formed by the flange 25, anornamental molding 2-8 is run longitudinally, as

shown. At suitable points along the length of the facing stringer, thematerial is pressed so as to form a recess 29, giving an ornamentalfinish to the stringer.

Having thus described my invention, I claim as new and desire to secureby Letters Patent: 1

1. A stringer for stairs having a web, and a flange at one edge thereof,said stringer having a landing portion inclined to the body of saidstringer and having a web and a flange at the edge thereof constitutingan uncut and continuous piece with said first flange, said webs beingoverlapped and fastened together.

2. A stringer for stairs having a lower portion, an upper portion and aninclined landing portion connecting the same, said lower portion havinga web and a flange at the upper edge thereof, said land ng portionhaving an upper flange uncut and forming one cone tinuous piece withsaid first flange, said upper portion havin a web and a flange at thelower edge thereo said landing portion having a lower flange uncut andforming one continuous piece with said lower flange of said CHARLESFRIEDRICH STEIBER.

Witnesses:

EDWARD SoHoPPE, PETE IMHOF.

